A disk origin for inner stellar halo structures around the Milky Way
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1 A disk origin for inner stellar halo structures around the Milky Way Adrian Price-Whelan (Princeton University)! adrn " adrianprw Kathryn Johnston, Allyson Sheffield, Chervin Laporte, Maria Bergemann, Branimir Sesar, Ting Li, Chris Hayes, Steve Majewski, Rachael Beaton, Judy Cohen, Andy Tzanidakis
2 Streams vs. structures Grillmair & Carlin 2016
3 Streams vs. structures C. Slater
4 Streams vs. structures Eastern Banded Structure (EBS) Monoceros, Anticenter Stream (ACS) Triangulum-Andromeda (TriAnd) C. Slater
5 Structures / clouds / shells Anticenter Stream (ACS) Eastern Banded Structure (EBS) Monoceros / Giant Anticenter Stellar Stream (GASS) / Low Latitude Stream (LLS) Triangulum-Andromeda A13 Hercules-Aquila cloud Virgo over-density Eridanus-Phoenix d ~ 8 kpc d ~ 10 kpc d ~ 8 12 kpc d ~ kpc d ~ kpc d ~ kpc d ~ 6 20 kpc d ~ 16 kpc (heliocentric)
6 Accreted debris? Kicked out of disk? D. Hendel A. Tzanidakis & C. Laporte
7 Accreted debris? Kicked out of disk? D. Hendel A. Tzanidakis & C. Laporte
8 the Triangulum-Andromeda region
9 the Triangulum-Andromeda region
10 Annoying Milky Way Foreground 20 i g i Martin+2007
11 Annoying Milky Way Foreground Monoceros 20 i d kpc Triand 1 & g i Martin+2007
12 As an accretion event: Size + metallicity of TriAnd would imply Sgr-mass progenitor Triand 1 Triand [Fe/H] Sheffield+2014
13 Sagittarius dsph metallicity distribution (RGB stars) APOGEE survey
14 RR Lyrae from Catalina Sky Survey TriAnd
15 vgsr [km s 1 ] P>0.8 P apple 0.8 M-giants 150 (M-giants) vgsr [km s 1 ] (RR Lyrae) M-giants RR Lyrae l [deg] N Price-Whelan+2015
16 Monoceros & A13
17 RR Lyrae from Catalina Sky Survey Monoceros/GASS A13 TriAnd
18 Sheffield, Price-Whelan+2018
19 TriAnd, Monoceros, A13 have many K/M giants, few (if any) RR Lyrae: suggests a stellar population unlike any of the dwarf satellites of the Milky Way The Milky Way disk is metal rich: few RR Lyrae, many K/M giants - could these features have originated in the disk?
20 but very far from disk Johnston, Price-Whelan+2017
21 Detailed chemistry of A13 & TriAnd
22 Bergemann,,Price-Whelan+2018
23 [Na/Fe] [Fe/H] Bergemann,,Price-Whelan+2018
24 0.5 Outer disk open clusters [Na/Fe] MW disk [Fe/H] Bergemann,,Price-Whelan+2018
25 0.5 Outer disk open clusters [Na/Fe] MW disk Sgr Fornax [Fe/H] Bergemann,,Price-Whelan+2018
26 0.5 Outer disk open clusters TriAnd / A13 [Na/Fe] MW disk Sgr Fornax [Fe/H] Bergemann,,Price-Whelan+2018
27 3D kinematics with Gaia
28 TriAnd stars Rotating with the disk, slightly slower than solar circular velocity σ vr = σ vz = 25 km s 1 v ϕ = 185 km s 1 σ vϕ 50 km s 1
29 Summary
30 Summary Many of the structures identified as streams, clouds, or halo overdensities are associated with or originate from the Galactic disk, but now at extreme radii/heights above disk
31 Disk Accretion Eastern Banded Structure (EBS) Anticenter Stream (ACS) Monoceros / GASS Hercules-Aquila Eri-Phoenix (?) Virgo (?) TriAnd A13
32 Disk Talk by Chervin Laporte Eastern Banded Structure (EBS) Anticenter Stream (ACS) Monoceros / GASS Accretion Hercules-Aquila Eri-Phoenix (?) Virgo (?) TriAnd A13 This talk
33 Summary Many of the structures identified as streams, clouds, or halo overdensities are associated with or originate from the Galactic disk, but now at extreme radii/heights above disk These stars could have been kicked out as a result of interactions with Sagittarius and the LMC
34 Laporte+2017
35 Summary Many of the structures identified as streams, clouds, or halo overdensities are associated with or originate from the Galactic disk, but now at extreme radii/heights above disk These stars could have been kicked out as a result of interactions with Sagittarius and the LMC These features are tracers of dark matter in the outer disk, and will constrain interaction history of the Milky Way and Sagittarius
36 Some relevant work: Newberg+2002 Martin+2007, 2014 Sheffield, Johnston+2014 Xu, Newberg+2015 Price-Whelan, Johnston, Sheffield+2015 Li, Sheffield+2017 Laporte+2017 Johnston, Price-Whelan+2017 Bergemann, Sesar+2018 Sheffield, Price-Whelan+2018 Hayes+2018
37 Extra slides
38 TriAnd Sgr LMC SMC Kirby+2013
39 Kirby+2013
40 RR Lyrae K/M Giants
41 [Mg/Fe] [Fe/H] Bergemann,,Price-Whelan+2018
42 Bergemann,,Price-Whelan+2018
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